OLED Luminance Control Using Chroma-Based APL Adjustment

The patent applies dynamics by making the luminance output adaptive rather than fixed. The controller dynamically adjusts the luminance based on real-time analysis of the input image's chroma characteristics, switching between first and second luminance values depending on whether the image is identified as high-chroma or low-chroma. This dynamic adjustment allows the system to optimize between display quality and pixel lifespan for different imaging conditions.

The patent applies local quality by differentiating the APL calculation method based on the specific characteristics of the input image. Instead of using a single universal calculation method, the system determines whether the image is high-chroma or low-chroma and selects the appropriate calculation method accordingly. This localized approach allows maximum RGB values to be used for simple grayscale images while employing luminance ratio calculations for accurate color image luminance assessment.

The patent converts the harmful effect of high-chroma images causing afterimages into a beneficial control mechanism. By detecting high-chroma characteristics and deliberately selecting the first luminance value (lower luminance) for such images, the system transforms what would be a harmful high-luminance output into a protective low-luminance output that prevents afterimages and extends pixel lifespan, while still maintaining acceptable image quality.